From what I remember, they came in little pots that I kept in a warm airing cupboard until they started to germinate. After that they went in special compost (for bonsai seedlings) on a windowsill that got plenty of light. I suspect though that the conditions they need will depend upon the variety of tree that you're trying to grow. Some will be hardier than others and will do well outdoors. Others will do better in artificial (indoor) conditions.
This looks to be a good explanation of how to germinate your seeds.
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